This is a fairly unremarkable lead. You connect it to a power supply and it lets you connect it to up 8 effects pedals, with each plug being separated by just over a foot, so it stretches quite a distance.
Two things to be aware of in this though. Make sure that the total current draw of all the devices connected doesn't exceed the power supply, which 8 devices could easily do, and also be aware that in the usual case of boss / behringer effects that are 9vdc with the centre ground, any of the 8 plugs not plugged into something are floating round in the air at 9v - if they touch the jack socket cases they will short out the power supply. Make sure they are tucked out the way or have tape over them. In an ideal case this would have plug covers but not really realistic at that price.
Anyway, it works well and seem robust enough to keep working for the life of your power supply.